Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c8ed071345b933…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 07:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3328d04000a5bdfe19739895a8942ca6 SHA-1: 70694b71b2404d3d1e95cb338071f3498be9bb37 SHA-256: 31c8ed071345b9338d2c4e87a1674743026365cc56be959eaae616c505b33e47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/bimasajinoserokamepalev.pdf In PDF document text
    • http://auburn-properties.com/userfiles/files/29408681973.pdfIn PDF document text
    • https://songhongresort.com/img/files/5849247638.pdfIn PDF document text
    • http://livestocktool.com/d/files/38695683679.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/xewuza.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/lukov.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95183587135.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/sevimamixepi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/80d8079384e61a5858f4de034602f184/54555386742.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/47914600864.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/58992385376.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/kubelavone.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/48315111594.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/tazatarilekokowiwizumo.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/39162850670.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/paresarodipepaxar.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/moxemifesutidezepajivole.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/73388422838.pdfIn PDF document text
    • http://djapm.com/userfiles/file/97011343120.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be155206c1---26569907521.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/92256878630.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/xelixidikawe.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/77643921116.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/gexunabifolinezuzam.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/16463431368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=wifi+cracker+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16C 10020 bytes
SHA-256: 5ce10c974faa85498fc8c6a45e5d358eefa5e07fbfab25b8a72afa523895650b
font_01_sfnt_off0000c7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CD 17116 bytes
SHA-256: 3b2d15da849cefad06ad6bb6a180bc7e0d0afcfa601292c8b5ef5786a9b8a1eb
font_02_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1